HARMONICOR

The harmonicor or Hautbois Nouveau ("New Oboe") was invented around 1861 by Louis Julien Jaulin of Paris and as its alternative name suggests, it was intended as a substitute for the oboe or cor anglais (hence harmoni-cor). It had 25 piston-like keys covering a range of two chromatic octaves, with white keys and black keys arranged in similar fashion to a piano keyboard.

The shape of the harmonicor as vaguely reminiscent of an oboe, but there was another version somewhat in the form of a trumpet, called the harmonitrompe.